Petrogenesis of Triassic granitoids in the Fengxian–Taibai ore cluster, Western Qinling Orogen, central China: Implications for tectonic evolution and polymetallic mineralization

Chen, Shao-Cong; Wang, Yitian; Yu, Jianhua; Hu, Qiaoqing; Zhang, Juan; Wang, Ruiting; Gao, Weihong; Wang, Chang‐An

doi:10.1016/j.oregeorev.2020.103577

Cited by 10 publications

(8 citation statements)

References 116 publications

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“…In the εHf(t)-age diagram (Figure 10b), the two-stage Hf model age calculated with the crust as the standard has a time gap of 1100-1300 Ma from the formation age of the rock mass, indicating that the parent magma of the granite was the product of the melting of the crustal material retained in the crust for a long time after the differentiation of the depleted mantle in the Mesoproterozoic period. The Xiba rock mass and the granite porphyry in the mining area were formed at 220-210 Ma [9,64]. In addition, the Hf isotope composition of the samples measured in this paper was similar to that of the contemporary Wulong rock mass in the South Qinling Mountains, suggesting that there is a similarity in the magma source area, and the source material was mainly the Mesoproterozoic crustal basement material [48,62].…”

Section: Source Characteristicsmentioning

confidence: 63%

“…Accurately determining the metallogenic age of Au deposits is very significant for studying their genesis and establishing their metallogenic models, as well as for studying The Xiba rock mass and the granite porphyry in the mining area were formed at 220-210 Ma [9,64]. In addition, the Hf isotope composition of the samples measured in this paper was similar to that of the contemporary Wulong rock mass in the South Qinling Mountains, suggesting that there is a similarity in the magma source area, and the source material was mainly the Mesoproterozoic crustal basement material [48,62].…”

Section: Formation Age Of Ore Bodymentioning

confidence: 99%

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Geochemistry and Zircon LA–ICP–MS U–Pb Geochronology of the Shuangwang Au Deposit, Shaanxi Province: Implications for Tectonic Evolution and Metallogenic Age

Jia,

Liu,

Wang

et al. 2024

Minerals

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The Shuangwang Au deposit (with a gold resource of approximately 70 t Au), is located in the Fenxian-Taibai fore-arc basin in the West Qinling Orogen of central China. Igneous intrusions in the region include the Xiba granitic pluton and granite porphyry and lamprophyre dykes. The Xiba pluton is composed of granodiorite and monzonite granite. The granodiorite is typical I-type granite, and it yields a crystallization age of 221.1 ± 1.2 Ma and a two-stage Hf model age of 1432–1634 Ma. The monzonite granite shows a transitional characteristic between I-type and A-type granite, and it yields a crystallization age of 214.8 ± 1.2 Ma and a two-stage Hf model age of 1443–1549 Ma. The granitoid was derived mainly from a crust–mantle mixed source. The ages indicate that the granodiorite and monzonite granite formed during two different stages. The REE distribution patterns of the Xiba granitoid exhibit significant fractionation between LREE and HREE, showing right-dipping curves, with an enrichment of LREE and a deficit of HREE. The granodiorite displays a light negative Eu anomaly, while the monzonite granite displays an obvious negative Eu anomaly. The granite porphyry dikes are distributed in the No. I breccia and Jiupinggou granite porphyry, and they yield crystallization ages of 219.9 ± 1.5 Ma and 213.1 ± 0.89 Ma, respectively, and two-stage Hf model ages of 1382–1501 Ma and 1373–1522 Ma, respectively. The lamprophyre dikes in the deposit yield a crystallization age of 214.4 ± 2.7 Ma. After the collision event between the Yangtze and the North China Plates along the Qinling orogenic belt, at approximately 220 Ma in the Late Triassic, the detachment of the slab produced the upwelling of the asthenosphere material. Under conditions of mantle heat and tectonic stress, widespread partial melting of the subducted continental crust and the upper lithosphere mantle occurred, forming granitoids with various degrees of adakite characteristics.

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Section: Source Characteristicsmentioning

confidence: 63%

Section: Formation Age Of Ore Bodymentioning

confidence: 99%

Geochemistry and Zircon LA–ICP–MS U–Pb Geochronology of the Shuangwang Au Deposit, Shaanxi Province: Implications for Tectonic Evolution and Metallogenic Age

Jia,

Liu,

Wang

et al. 2024

Minerals

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“…There are several diorite porphyry dikes and granite porphyry dikes, filling the NE-trending and NWW-trending faults, respectively. The diorite porphyry dikes crosscut the main orebody, while the granite porphyry dikes-with zircon U-Pb ages of 226~221 Ma (LA-ICP-MS; [25])-are roughly parallel to the main orebody (Figures 3 and 4a). The main minerals of the granite porphyry dikes are plagioclase (30%), potash feldspar (35%), quartz (30%), biotite (3%), pyrite, zircon, sphene, etc.…”

Section: Rocksmentioning

confidence: 99%

“…Similar ages have been obtained from the igneous rocks of the Fengtai ore cluster. For example, the NWW-trending granite porphyry dike of the Dongtangzi deposit has yielded a zircon U-Pb age of 221.3 ± 1.4 Ma [25]; the granite porphyry dike and the NE-trending diorite dikes crosscutting the main orebody of the Bafangshan-Erlihe deposit and those within the mine area have yielded zircon U-Pb ages of 217.9 ± 4.5 Ma and 221 ± 3 Ma [21], respectively. Furthermore, the monzonitic granite and granodiorite of the Xiba pluton (Figure 1c) yielded zircon U-Pb ages of 219 ± 1 Ma and 218 ± 1 Ma, respectively [95].…”

Section: Timing Of the Ore Formationmentioning

confidence: 99%

Genesis of the Dongtangzi Zn-Pb Deposit of the Fengxian–Taibai Ore Cluster in West Qinling, China: Constraints from Rb-Sr and Sm-Nd Geochronology, and In Situ S-Pb Isotopes

Hu,

Wang,

Chen

et al. 2024

Minerals

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The large Dongtangzi Zn-Pb deposit is located in the southwest of the Fengxian–Taibai (abbreviated as Fengtai) ore cluster in the west Qinling orogen. The origin of the deposit is controversial, positing diverse genesis mechanisms such as sedimentary-exhalative (SEDEX), sedimentary-reformed, and epigenetic-hydrothermal types. This study combines systematic ore geology observations with high-precision Rb-Sr and Sm-Nd ages of 211 Ma and in situ S-Pb isotopes to constrain the timing and origin of mineralization. In situ S-Pb isotopic studies show that the sulfide ores display a narrow range of δ34S values from 1.1‰ to 10.2‰, with 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb ratios of 18.07 to 18.27, 15.64 to 15.66, and 38.22 to 38.76, respectively. On the other hand, pyrites of the sedimentary period and the granite porphyry dike have δ34S values ranging from 15.8 to 21.4‰ and from 2.1 to 4.3‰ (with 206Pb/204Pb ratios of 18.09 to 18.10, 207Pb/204Pb ratios of 15.59 to 15.61, and 208Pb/204Pb ratios of 38.17 to 38.24), respectively. The above-mentioned S-Pb isotopic compositions indicate that the metallic materials involved in ore formation originated from a mixture of Triassic magmatic hydrothermal fluid and metamorphic basement. By integrating the regional geology, mineralization ages, and S-Pb isotopic studies, we propose that the Dongtangzi Zn-Pb deposit is the product of epigenetic hydrothermal fluid processes, driven by Late Triassic regional tectono-magmatic processes.

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“…The NQB is predominately composed of Precambrian basement, Neoproterozoic and early Paleozoic ophiolites, and volcano-sedimentary assemblages, which are unconformably overlain by late Paleozoic sedimentary rocks (Dong et al, 2011). The SQB consists mainly of the early Paleozoic limestones and shales, late Paleozoic clastic sediments intercalated with limestone, Mesozoic sandstones, and early Mesozoic granitoids (Duan et al, 2016;Chen et al, 2020). The northern YC consists mainly of middle to upper Proterozoic volcano-sedimentary successions and Neoproterozoic mafic and granitoid intrusions overlain by Sinian-Mesozoic sedimentary rocks (Dong et al, 2011;Yang et al, 2017).…”

Section: Tectonic Frameworkmentioning

confidence: 99%

In Situ Rb‐Sr Dates of Muscovite and Sulfur Isotope of Pyrite from the Yangshan Gold Deposit in Western Qinling, China

HUANG,

QI,

et al. 2023

Acta Geologica Sinica (Eng)

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Located along the southern part of the West Qinling, Yangshan gold deposit is one of the largest gold deposits in China. The major gold ores of the Yangshan are disseminated in metasedimentary host rocks with minor native golds amounts in stibnite‐gold quartz veins. Pyrite and arsenopyrite are the major Au‐bearing minerals. Hydrothermal muscovite from gold‐bearing quartz vein was dated by in situ Rb‐Sr method to determine the formation age of the Yangshan gold deposit. The Rb‐Sr isochron age of the muscovite yielded 210.1 ± 5.6 Ma (MSWD = 1.2). This age is near the lower end of the period of the mineralized granitic dykes (210.49–213.10Ma). Two stages of gold‐rich process are recognized in gold bearing pyrite. The first gold enrichment process is incorporated with the Co, Cu, As, Ni enrichment. And the second stage of gold enrichment is accompanied by Bi, Co, Ni, Pb, Cu, Sb concentration. The in‐situ sulfur isotopic values of pyrites show a restricted δ34S range of ‐1.43 to 2.86 ‰ with a mean value of 0.43 ‰. Trace‐element mapping and in‐situ sulfur isotopic analysis of pyrite suggest that the sulfur sources are likely derived from magmatic source and likely assimilated by sulfur from the sedimentary bedrock. The magmatism plays a critical role in the formation of the Yangshan gold deposit.

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Petrogenesis of Triassic granitoids in the Fengxian–Taibai ore cluster, Western Qinling Orogen, central China: Implications for tectonic evolution and polymetallic mineralization

Cited by 10 publications

References 116 publications

Geochemistry and Zircon LA–ICP–MS U–Pb Geochronology of the Shuangwang Au Deposit, Shaanxi Province: Implications for Tectonic Evolution and Metallogenic Age

Geochemistry and Zircon LA–ICP–MS U–Pb Geochronology of the Shuangwang Au Deposit, Shaanxi Province: Implications for Tectonic Evolution and Metallogenic Age

Genesis of the Dongtangzi Zn-Pb Deposit of the Fengxian–Taibai Ore Cluster in West Qinling, China: Constraints from Rb-Sr and Sm-Nd Geochronology, and In Situ S-Pb Isotopes

In Situ Rb‐Sr Dates of Muscovite and Sulfur Isotope of Pyrite from the Yangshan Gold Deposit in Western Qinling, China

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